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4(d-5)+5d=13
We move all terms to the left:
4(d-5)+5d-(13)=0
We add all the numbers together, and all the variables
5d+4(d-5)-13=0
We multiply parentheses
5d+4d-20-13=0
We add all the numbers together, and all the variables
9d-33=0
We move all terms containing d to the left, all other terms to the right
9d=33
d=33/9
d=3+2/3
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